Is there a way that I can tell without taking it in? Are all of these things located where they can be cracked this way?Is there a way that I can tell without taking it in? Are all of these things located where they can be cracked this way?

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CHECK SEE IF THE VENT HOSE FROM FILLER NECK IS RUSTED OUT AND HAS A HOLE IF SO REPLACE IT OR PATCH IT . THIS IS A COMMON PROB AS THE MANURFACCTURE DIDNT PRIMER THIS VENT AND IT RUST AND GAIN A HOLE AND THE VAPORS LEAK INTO THE CAR ON PASSENGER SIDE IN BACK CAN BE REALLY STRON AT TIMES, DONT LET ANY ONE SMOKE IN THE CAR AS THE VAPOR IS HIGHLY FLAMABLE.

If it is a gas leak and not an exhaust leak, let it sit in park and look under the car for the leak (above and on the floor). At times it is the lines of the sending unit found above the gas tank. Do not drive it! The leak can catch on fire ( the leak can spread over hot parts of the car while driving). If you find the leak, have it towed to your mechanic for repair.

May be nothing more than a faulty gas cap or vent hose from the tank to the filler neck. Your charcoal canister for the fuel evaporation system may not be purging. It could be filling up with gas. It will eventually overflow, allowing you to see the problem.

I have a 2003 Nissan Frontier, i had the same problem last month with heavy gas smell coming from the back end of the truck. I took it into the shop and they did a Diagnostic Test and found that the Evap Canister...now they've changed it..no gas smell... Try this and Good Luck...